Pesticides commonly used as flea treatments for pets are contaminating English rivers

Researchers at the University of Sussex have found widespread contamination of English rivers with two neurotoxic pesticides commonly used in veterinary flea products: fipronil and the neonicotinoid imidacloprid. The concentrations found often far exceeded accepted safe limits.

source https://phys.org/news/2020-11-pesticides-commonly-flea-treatments-pets.html